/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */
package org.apache.iceberg.deletes;

import org.apache.iceberg.relocated.com.google.common.base.Preconditions;

public class PositionDeleteIndexUtil {

  private PositionDeleteIndexUtil() {}

  public static PositionDeleteIndex merge(Iterable<? extends PositionDeleteIndex> indexes) {
    BitmapPositionDeleteIndex result = new BitmapPositionDeleteIndex();

    for (PositionDeleteIndex index : indexes) {
      if (index.isNotEmpty()) {
        Preconditions.checkArgument(
            index instanceof BitmapPositionDeleteIndex,
            "Can merge only bitmap-based indexes, got %s",
            index.getClass().getName());
        result.merge((BitmapPositionDeleteIndex) index);
      }
    }

    return result;
  }
}
